Page 22 - 5_TOC in daily practice
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SCA-130-511
The TOC-V WP contains an automatic reagent ■ Limitations
preparation function that eliminates possible The wet chemical oxidation detects less
contamination of the persulphate solution in particles. To measure samples containing
order to assure that the average TOC value particles the catalytic combustion with its
truly originates from the sample – and not higher oxidation potential has to be used.
from the reagent solution used. In addition, simultaneous TOC/TN b
measurements can be carried out.
The sample is added to the persulphate
solution in the TC reactor, which is heated ■ Application
under UV illumination to convert the carbon The main domain of the wet chemical
content to carbon dioxide. oxidation is the analyses of ultra pure water
(pharma water, semiconductor industry,
condensate…), because of the low detection
and good reproducibility in the ppb range.
Or in special applications, where the
combustion technique is not suitable.
Example of applications
205 TOC determination in ultra pure
water with wet chemical oxidation
309 TOC determination in phosphoric
acid (TOC-V WP)
Figure.: TC reactor with integrated UV lamp and heating
■ Advantage of the method
In the combustion oxidation the injection
volume is limited to 2000µl (because of the
pressure impulse after injection). The wet
chemical oxidation can use injection volume
up to 20400µl. This high injection volume
leads to higher sensitivity and therefore Figue: TOC-V WP with ASI-V
enables high precision measurements in the
lower ppb range. ■ Recommended analyzer / Configuration
The detection limit of these systems is TOC-V WP/WS
0,5µg/L. ASI-V (with 40ml or 125ml vials)
